Index: src/wp-content/themes/twentyfifteen/functions.php
===================================================================
--- src/wp-content/themes/twentyfifteen/functions.php	(revision 41035)
+++ src/wp-content/themes/twentyfifteen/functions.php	(working copy)
@@ -386,6 +386,24 @@
 add_filter( 'get_search_form', 'twentyfifteen_search_form_modify' );
 
 /**
+ * Modifies tag cloud widget arguments to have all tags in the widget same font size and use list format for better accessibility.
+ *
+ * @since Twenty Fifteen 1.8
+ *
+ * @param array $args Arguments for tag cloud widget.
+ * @return array A new modified arguments.
+ */
+function twentyfifteen_widget_tag_cloud_args( $args ) {
+    $args['largest']  = 22;
+    $args['smallest'] = 8;
+    $args['unit']     = 'pt';
+    $args['format']   = 'list';
+    return $args;
+}
+add_filter( 'widget_tag_cloud_args', 'twentyfifteen_widget_tag_cloud_args' );
+
+
+/**
  * Implement the Custom Header feature.
  *
  * @since Twenty Fifteen 1.0
Index: src/wp-content/themes/twentyfifteen/style.css
===================================================================
--- src/wp-content/themes/twentyfifteen/style.css	(revision 41035)
+++ src/wp-content/themes/twentyfifteen/style.css	(working copy)
@@ -2681,7 +2681,16 @@
 	margin-bottom: 0;
 }
 
+.tagcloud ul {
+	list-style-type: none;
+}
 
+.tagcloud ul li {
+	display: inline-block;
+	margin: 4px 4px 0 0;
+}
+
+
 /**
  * 16.0 Media Queries
  */